order_by datetime

[ivan98]

When I have a model like:

class Entry(Model):
    published = props.DateTime(indexed=True)

My query (following the example @ https://anom.defn.io/quickstart.html?highlight=order_by)

        return Entry.query().with_ancestor(Key(Feed, str(feed_id))) \
            .order_by(Entry.published).run(limit=toreturn_count)

Will crash with:

  ...
  File "/env/lib/python3.7/site-packages/anom/query.py", line 110, in __next__
    return next(self._entities)
  File "/env/lib/python3.7/site-packages/anom/query.py", line 149, in _get_entities
    for batch in self._get_batches():
  File "/env/lib/python3.7/site-packages/anom/query.py", line 118, in _get_batches
    entities, self._options.cursor = adapter.query(self._query, self._options)
  File "/env/lib/python3.7/site-packages/anom/adapters/datastore_adapter.py", line 179, in query
    for entity in result_iterator:
  File "/env/lib/python3.7/site-packages/google/api_core/page_iterator.py", line 212, in _items_iter
    for page in self._page_iter(increment=False):
  File "/env/lib/python3.7/site-packages/google/api_core/page_iterator.py", line 243, in _page_iter
    page = self._next_page()
  File "/env/lib/python3.7/site-packages/google/cloud/datastore/query.py", line 525, in _next_page
    query_pb = self._build_protobuf()
  File "/env/lib/python3.7/site-packages/google/cloud/datastore/query.py", line 464, in _build_protobuf
    pb = _pb_from_query(self._query)
  File "/env/lib/python3.7/site-packages/google/cloud/datastore/query.py", line 595, in _pb_from_query
    if prop.startswith("-"):
AttributeError: 'DateTime' object has no attribute 'startswith'"  
 timestamp: "2020-02-13T03:54:57.553739Z"  
}

I need to change my query to:

        return Entry.query().with_ancestor(Key(Feed, str(feed_id))) \
            .order_by('published').run(limit=toreturn_count)

or

        return Entry.query().with_ancestor(Key(Feed, str(feed_id))) \
            .order_by('-published').run(limit=toreturn_count)